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// packaged_task::get_future
#include <iostream> // std::cout
#include <utility> // std::move
#include <future> // std::packaged_task, std::future
#include <thread> // std::thread
// a simple task:
int triple (int x) { return x*3; }
int main ()
{
std::packaged_task<int(int)> tsk (triple); // package task
std::future<int> fut = tsk.get_future(); // get future
std::thread(std::move(tsk),33).detach(); // spawn thread and call task
// ...
int value = fut.get(); // wait for the task to complete and get result
std::cout << "The triple of 33 is " << value << ".\n";
return 0;
}
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